edf40wrjww2CF_PaperMaster:Desc
NYPD CASE:
18 patrol cars and 6 precints.
Three 8 hour tours of duty:
• 12am-8am (200/1300)
• 8am-4pm (400/1300)
• 4pm-12am (600/1300)
Most all cars are staffed with two officers.
Emergancy calls most frequent in the early evening hours (4pm-12am shift)
Dispatchers are responsible for 2-3 precints.
Police car dispatched to a job:
Average time per incedent = 30 minutes.
Precinct Average Number of Calls/Hour High Priority Calls (%) Total Felonies Per Year Size (SQ.MI)
A 6.4 8.2 10,600 1.9
B 3.8 7.7 6,600 .8
C 2.6 7.3 4,300 5.2
D 3.4 13.8 9,400 1
E 1.5 4 1,800 17
F 6.6 12.2 8,500 1.7
Average Util.
Arival Rate / Service Rate
Precint A: [6.4calls/hr / (18 patrol cars * 2calls/hr] = .1777 or 17.7%
Precint B: [3.8calls/hr / (18 patrol cars * 2calls/hr] = .1055 or 10.5%
Precint C: [2.6calls/hr / (18 patrol cars * 2calls/hr] = .0722 or 7.22%
Precint D: [3.4calls/hr / (18 patrol cars * 2calls/hr] = .0944 or 9.44%
Precint E: [1.5calls/hr / (18 patrol cars * 2calls/hr] = .0416 or 4.16%
Precint F: [6.6calls/hr / (18 patrol cars * 2calls/hr] = .1833 or 18.3%
Optimal Number of Patrol Cars:
Pre ...